You must have an active merchant account with Coinbase. Once you have your merchant account activated, login to coinbase.com, click on Settings --> API Access and create a NEW api key and make sure that, at a minimum, the settings match the ones in the attached image. Also, you'll have to enter your callback URL (yourvb.com/payment_gateway.php?method=coinbase).

This may work with older vBulletin versions down to v4.0.x, but it has not been tested.

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after searching here it said vbulletin 4.2.2 doesn't work with PHP 5.6
but your plugin mention that it's working with 4.2.x
I really don't understand and I don't even know how to downgrade the php version and make my website works again